05Icon progress ring — an indicator whose circular progress value fills with the pulled distance and morphs into a checkmark once complete

<main class="stage">
<div class="prim is-demo" id="prim">
  <div class="prim__phone" id="primPhone">
    <div class="prim__ringwrap">
      <svg class="prim__ring" viewBox="0 0 56 56" width="56" height="56">
        <circle class="prim__ring-track" cx="28" cy="28" r="22"></circle>
        <circle class="prim__ring-bar" id="primBar" cx="28" cy="28" r="22"></circle>
        <polyline class="prim__check" id="primCheck" points="17,29 24,36 40,19"></polyline>
      </svg>
    </div>
    <div class="prim__list">
      <div class="prim__row"></div>
      <div class="prim__row"></div>
    </div>
  </div>
  <span class="prim__hint" id="primHint">Pull down</span>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 계산 겹(진행률→strokeDashoffset 환산)은 JS 에 있다 — 여기는 정적 배치만.
@include stage($stage-ink);

.prim {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.prim__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: $r-card;
  background: rgba($subject-cream, .07);
  touch-action: none;
  cursor: grab;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: $sp-3;
}

.prim__ringwrap {
  position: relative;
  width: 56px;
  height: 56px;
}

.prim__ring {
  width: 56px;
  height: 56px;
}

.prim__ring-track {
  fill: none;
  stroke: rgba($subject-cream, .18);
  stroke-width: 4;
}

.prim__ring-bar {
  fill: none;
  stroke: $subject-blue-light;
  stroke-width: 4;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 28px 28px;
}

.prim__check {
  fill: none;
  stroke: $subject-mint;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.prim__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  width: 100%;
  padding: 0 $sp-4;
}

.prim__row {
  height: 16px;
  border-radius: $r-xs;
  background: rgba($subject-cream, .10);
}

.prim__hint {
  color: $subject-cream;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prim__phone { width: 176px; height: 140px; }
  .prim__ringwrap, .prim__ring { width: 46px; height: 46px; }
}

@media (prefers-reduced-motion: reduce) {
  .prim__ring-bar, .prim__check { transition: none !important; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.prim {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.prim__phone {
  position: relative;
  width: 220px;
  height: 168px;
  overflow: hidden;
  border-radius: 16px;
  background: rgba(255, 247, 230, 0.07);
  touch-action: none;
  cursor: grab;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.prim__ringwrap {
  position: relative;
  width: 56px;
  height: 56px;
}

.prim__ring {
  width: 56px;
  height: 56px;
}

.prim__ring-track {
  fill: none;
  stroke: rgba(255, 247, 230, 0.18);
  stroke-width: 4;
}

.prim__ring-bar {
  fill: none;
  stroke: #5b8cf8;
  stroke-width: 4;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 28px 28px;
}

.prim__check {
  fill: none;
  stroke: #4cd4a6;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.prim__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  padding: 0 16px;
}

.prim__row {
  height: 16px;
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.1);
}

.prim__hint {
  color: #fff7e6;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 340px) {
  .prim__phone {
    width: 176px;
    height: 140px;
  }
  .prim__ringwrap, .prim__ring {
    width: 46px;
    height: 46px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .prim__ring-bar, .prim__check {
    transition: none !important;
  }
}

(function () {
  var phone = document.getElementById('primPhone');
  var bar = document.getElementById('primBar');
  var check = document.getElementById('primCheck');
  var hint = document.getElementById('primHint');
  var root = document.getElementById('prim');

  // 계산 겹: Pull 거리(raw)를 REF 로 나눈 progress(0~1)를 원 둘레(C)에 곱해
  // strokeDashoffset 을 직접 놓는다 — 프레임마다 새 각도를 계산하는 것이지 CSS 트랜지션이 아니다.
  var REF = 130, MAX = 150;
  var R = 22, C = 2 * Math.PI * R;
  bar.style.strokeDasharray = C.toFixed(2);
  var checkLen = check.getTotalLength();
  check.style.strokeDasharray = checkLen.toFixed(2);
  check.style.strokeDashoffset = checkLen.toFixed(2);

  function ringOf(progress) { return C * (1 - progress); }

  function apply(raw) {
    var progress = Math.max(0, Math.min(1, raw / REF));
    bar.style.strokeDashoffset = ringOf(progress).toFixed(2);
    var pct = Math.round(progress * 100);
    hint.textContent = progress >= 1 ? 'Release to refresh' : (raw > 4 ? ('Pull progress ' + pct + '%') : 'Pull down');
  }

  var committing = false, commitTimer = null;
  function commit() {
    committing = true;
    hint.textContent = 'Refresh complete';
    var start = null, dur = 320;
    function step(ts) {
      if (start === null) { start = ts; }
      var t = Math.min(1, (ts - start) / dur);
      check.style.strokeDashoffset = (checkLen * (1 - t)).toFixed(2);
      if (t < 1) { requestAnimationFrame(step); }
    }
    requestAnimationFrame(step);
    commitTimer = setTimeout(function () {
      check.style.strokeDashoffset = checkLen.toFixed(2);
      committing = false;
      bar.style.strokeDashoffset = C.toFixed(2);
      hint.textContent = 'Pull down';
      apply(0);
    }, 760);
  }

  var raw = 0, target = 0, raf = null;
  function settle() {
    raw += (target - raw) * 0.28;
    if (Math.abs(target - raw) < 0.3) { raw = target; }
    apply(raw);
    if (raw !== target) { raf = requestAnimationFrame(settle); } else { raf = null; }
  }
  function goTo(v) { target = v; if (raf === null) { raf = requestAnimationFrame(settle); } }

  var dragging = false, startY = 0, startRaw = 0;
  function onDown(y) { if (committing) { return; } dragging = true; startY = y; startRaw = raw; if (raf) { cancelAnimationFrame(raf); raf = null; } }
  function onMove(y) {
    if (!dragging) { return; }
    raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
    apply(raw);
  }
  function onUp() {
    if (!dragging) { return; }
    dragging = false;
    if (raw >= REF) { commit(); } else { goTo(0); }
  }

  function wireReal() {
    phone.addEventListener('pointerdown', function (e) { root.classList.remove('is-demo'); stopAutoplay(); onDown(e.clientY); });
    window.addEventListener('pointermove', function (e) { onMove(e.clientY); });
    window.addEventListener('pointerup', onUp);
  }
  phone.style.touchAction = 'none';
  wireReal();
  apply(0);

  var autoRaw = 0, autoTimer = null;
  function autoTick() {
    if (committing) { return; }
    autoRaw += 22;
    if (autoRaw >= REF) { raw = REF; apply(raw); autoRaw = 0; commit(); return; }
    raw = autoRaw; apply(raw);
  }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } if (commitTimer) { clearTimeout(commitTimer); } }
  if (!reduce) { autoTimer = setInterval(autoTick, 190); }
})();

import { useEffect, useRef } from "react";
import styles from "./PullRefreshIconProgressMorph.module.scss";

export type PullRefreshIconProgressMorphProps = {
  color?: string;
};

export default function PullRefreshIconProgressMorph({
  color = "#5b8cf8",
}: PullRefreshIconProgressMorphProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const phone = root.querySelector<HTMLDivElement>(`.${styles.phone}`);
    const bar = root.querySelector<SVGCircleElement>(`.${styles["ring-bar"]}`);
    const check = root.querySelector<SVGPolylineElement>(`.${styles.check}`);
    const hint = root.querySelector<HTMLSpanElement>(`.${styles.hint}`);
    if (!phone || !bar || !check || !hint) return;

    // 계산 겹: 당김 거리(raw)를 REF 로 나눈 progress(0~1)를 원 둘레(C)에 곱해
    // strokeDashoffset 을 직접 놓는다 — 프레임마다 새 각도를 계산하는 것이지 CSS 트랜지션이 아니다.
    const REF = 130, MAX = 150;
    const R = 22, C = 2 * Math.PI * R;
    bar.style.strokeDasharray = C.toFixed(2);
    const checkLen = check.getTotalLength();
    check.style.strokeDasharray = checkLen.toFixed(2);
    check.style.strokeDashoffset = checkLen.toFixed(2);

    function ringOf(progress: number) { return C * (1 - progress); }

    function apply(raw: number) {
      const progress = Math.max(0, Math.min(1, raw / REF));
      bar!.style.strokeDashoffset = ringOf(progress).toFixed(2);
      const pct = Math.round(progress * 100);
      hint!.textContent = progress >= 1 ? "놓으면 새로고침" : (raw > 4 ? ("당김 진행 " + pct + "%") : "아래로 당기세요");
    }

    let committing = false, commitTimer: number | null = null;
    function commit() {
      committing = true;
      hint!.textContent = "새로고침 완료";
      let start: number | null = null;
      const dur = 320;
      function step(ts: number) {
        if (start === null) start = ts;
        const t = Math.min(1, (ts - start) / dur);
        check!.style.strokeDashoffset = (checkLen * (1 - t)).toFixed(2);
        if (t < 1) { requestAnimationFrame(step); }
      }
      requestAnimationFrame(step);
      commitTimer = window.setTimeout(() => {
        check!.style.strokeDashoffset = checkLen.toFixed(2);
        committing = false;
        bar!.style.strokeDashoffset = C.toFixed(2);
        hint!.textContent = "아래로 당기세요";
        apply(0);
      }, 760);
    }

    let raw = 0, target = 0, raf: number | null = null;
    function settle() {
      raw += (target - raw) * 0.28;
      if (Math.abs(target - raw) < 0.3) raw = target;
      apply(raw);
      raf = raw !== target ? requestAnimationFrame(settle) : null;
    }
    function goTo(v: number) { target = v; if (raf === null) { raf = requestAnimationFrame(settle); } }

    let dragging = false, startY = 0, startRaw = 0;
    function onDown(y: number) {
      if (committing) return;
      dragging = true; startY = y; startRaw = raw;
      if (raf !== null) { cancelAnimationFrame(raf); raf = null; }
    }
    function onMove(y: number) {
      if (!dragging) return;
      raw = Math.max(0, Math.min(MAX, startRaw + (y - startY)));
      apply(raw);
    }
    function onUp() {
      if (!dragging) return;
      dragging = false;
      if (raw >= REF) { commit(); } else { goTo(0); }
    }

    function onPointerDown(e: PointerEvent) { stopAutoplay(); onDown(e.clientY); }
    function onPointerMove(e: PointerEvent) { onMove(e.clientY); }
    phone.style.touchAction = "none";
    phone.addEventListener("pointerdown", onPointerDown);
    window.addEventListener("pointermove", onPointerMove);
    window.addEventListener("pointerup", onUp);
    apply(0);

    let autoRaw = 0, autoTimer: number | null = null;
    function autoTick() {
      if (committing) return;
      autoRaw += 22;
      if (autoRaw >= REF) { raw = REF; apply(raw); autoRaw = 0; commit(); return; }
      raw = autoRaw; apply(raw);
    }
    function stopAutoplay() {
      if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; }
      if (commitTimer !== null) { window.clearTimeout(commitTimer); }
    }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 190); }

    return () => {
      stopAutoplay();
      if (raf !== null) cancelAnimationFrame(raf);
      phone.removeEventListener("pointerdown", onPointerDown);
      window.removeEventListener("pointermove", onPointerMove);
      window.removeEventListener("pointerup", onUp);
    };
  }, []);

  return (
    <div ref={rootRef} className={styles.stage}>
      <div className={styles.prim}>
        <div className={styles.phone}>
          <div className={styles.ringwrap}>
            <svg className={styles.ring} viewBox="0 0 56 56" width="56" height="56">
              <circle className={styles["ring-track"]} cx="28" cy="28" r="22" />
              <circle className={styles["ring-bar"]} cx="28" cy="28" r="22" style={{ "--accent": color } as any} />
              <polyline className={styles.check} points="17,29 24,36 40,19" />
            </svg>
          </div>
          <div className={styles.list}>
            <div className={styles.row} />
            <div className={styles.row} />
          </div>
        </div>
        <span className={styles.hint}>아래로 당기세요</span>
      </div>
    </div>
  );
}